THC/CBD was effective in reducing pains with no evidence of tolerance for the 2 years tested.
Link: Oromucosal Delta9-tetrahydrocannabinol/cannabidiol For Neuropathic Pain Associated With Multiple Sclerosis: An Uncontrolled, Open-label, 2-year Extension Trial
Year: 2007
DOI: 10.1016/j.clinthera.2007.09.013
Demonstrable efficacy of cannabis for treatment of Multiple Sclerosis (MS) according to the results found in this study.
Sativex (THC:CBD)